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><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="GENERAL"
>1. General Information</A
></H1
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="WHO-USES"
>1.1. Who should give <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> a try?</A
></H3
><P
>  Anyone who is interested in security, privacy, or in 
  finer-grained control over their web and Internet experience.
 </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="BESTCHOICE"
>1.2. Is Privoxy the best choice for
me?</A
></H3
><P
>  <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> is certainly a good choice, especially for those who want more 
  control and security. Those with the willingness to read the documentation
  and the ability to fine-tune their installation will benefit the most.
 </P
><P
>  One of <SPAN
CLASS="APPLICATION"
>Privoxy's</SPAN
>
  strengths is that it is highly configurable giving you the ability to
  completely personalize your installation. Being familiar with, or at least
  having an interest in learning about <A
HREF="http://en.wikipedia.org/wiki/Http"
TARGET="_top"
>HTTP</A
> and other networking
  protocols, <A
HREF="http://en.wikipedia.org/wiki/Html"
TARGET="_top"
>HTML</A
>, and 
  <A
HREF="http://en.wikipedia.org/wiki/Regular_expressions"
TARGET="_top"
><SPAN
CLASS="QUOTE"
>"Regular
  Expressions"</SPAN
></A
>
  will be a big plus and will help you get the most out of <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>. 
  A new installation just includes a very basic configuration. The user 
  should take this as a starting point only, and enhance it as he or she 
  sees fit. In fact, the user is encouraged, and expected to, fine-tune the 
  configuration.
 </P
><P
>  Much of <SPAN
CLASS="APPLICATION"
>Privoxy's</SPAN
> configuration can be done 
  with a <A
HREF="http://en.wikipedia.org/wiki/Web_browser"
TARGET="_top"
>Web browser</A
>.
  But there are areas where configuration is done using a 
  <A
HREF="http://en.wikipedia.org/wiki/Text_editors"
TARGET="_top"
>text editor</A
>
  to edit configuration files. Also note that the web-based action editor
  doesn't use authentication and should only be enabled in environments
  where all clients with access to <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> listening port can be trusted.
  </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="PROXYMORON"
>1.3. What is a <SPAN
CLASS="QUOTE"
>"proxy"</SPAN
>? How does
Privoxy work?</A
></H3
><P
>  A <A
HREF="http://en.wikipedia.org/wiki/Proxy_server"
TARGET="_top"
>web proxy</A
>
  is a service, based on a software such as <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>, that clients
  (i.e. browsers) can use instead of connecting to web servers directly.
  The clients then ask the proxy to request objects (web pages, images, movies etc)
  on their behalf and to forward the data to the clients.
  It is a <SPAN
CLASS="QUOTE"
>"go-between"</SPAN
>. For details, see
  <A
HREF="http://en.wikipedia.org/wiki/Proxy_server"
TARGET="_top"
>Wikipedia's proxy definition</A
>.
 </P
><P
>  There are many reasons to use web proxies, such as security (firewalling),
  efficiency (caching) and others, and there are any number of proxies
  to accommodate those needs.
 </P
><P
>  <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> is a proxy that is primarily focused on
  privacy enhancement, ad and junk elimination and freeing the user from
  restrictions placed on his activities. Sitting between your browser(s) and the Internet,
  it is in a perfect position to filter outbound personal information that your
  browser is leaking, as well as inbound junk. It uses a variety of techniques to do
  this, all of which are under your complete control via the various configuration
  files and options. Being a proxy also makes it easier to share
  configurations among multiple browsers and/or users.
 </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="OTHERSTUFF"
>1.4. Does Privoxy do anything more than ad blocking?</A
></H3
><P
> 
  Yes, ad blocking is but one possible use. There are many, many ways <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> 
  can be used to sanitize and customize web browsing. </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="NEWJB"
>1.5. What is this new version of 
<SPAN
CLASS="QUOTE"
>"Junkbuster"</SPAN
>?</A
></H3
><P
> A long time ago, there was the
 <A
HREF="http://www.junkbusters.com/ijb.html"
TARGET="_top"
><SPAN
CLASS="APPLICATION"
>Internet Junkbuster</SPAN
></A
>, 
 by Anonymous Coders and <A
HREF="http://www.junkbusters.com/"
TARGET="_top"
>Junkbusters
 Corporation</A
>. This saved many users a lot of pain in the early days of
 web advertising and user tracking.</P
><P
> But the web, its protocols and standards, and with it, the techniques for
 forcing ads on users, give up autonomy over their browsing, and
 for tracking them, keeps evolving. Unfortunately, the <SPAN
CLASS="APPLICATION"
>Internet
 Junkbuster</SPAN
> did not. Version 2.0.2, published in 1998, was 
 (and is) the last official
 <A
HREF="http://www.junkbusters.com/ijbdist.html#release"
TARGET="_top"
>release</A
>
 available from <A
HREF="http://www.junkbusters.com"
TARGET="_top"
>Junkbusters Corporation</A
>.
 Fortunately, it had been released under the GNU
 <A
HREF="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html"
TARGET="_top"
>GPL</A
>,
 which allowed further development by others.</P
><P
> So Stefan Waldherr started maintaining an improved version of the
 software, to which eventually a number of people contributed patches.
 It could already replace banners with a transparent image, and had a first
 version of pop-up killing, but it was still very closely based on the
 original, with all its limitations, such as the lack of HTTP/1.1 support,
 flexible per-site configuration, or content modification. The last release
 from this effort was version 2.0.2-10, published in 2000.</P
><P
> Then, some
 <A
HREF="http://www.privoxy.org/user-manual/copyright.html#AUTHORS"
TARGET="_top"
>developers</A
>
 picked up the thread, and started turning the software inside out, upside down,
 and then reassembled it, adding many
 <A
HREF="http://www.privoxy.org/user-manual/introduction.html#FEATURES"
TARGET="_top"
>new
 features</A
> along the way.</P
><P
> The result of this is <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>, whose first
 stable version, 3.0, was released August, 2002. 
 </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="AEN78"
>1.6. Why <SPAN
CLASS="QUOTE"
>"Privoxy"</SPAN
>? Why change the name from
Junkbuster at all?</A
></H3
><P
> Though outdated, <A
HREF="http://junkbusters.com/"
TARGET="_top"
>Junkbusters Corporation</A
>
 continues to offer their original version of the <SPAN
CLASS="APPLICATION"
>Internet
 Junkbuster</SPAN
>, so publishing our
 <SPAN
CLASS="APPLICATION"
> Junkbuster</SPAN
>-derived software under the same name
 led to confusion.</P
><P
> There are also potential legal complications from our use of the 
 <SPAN
CLASS="APPLICATION"
>Junkbuster</SPAN
> name, which is a registered trademark of 
 <A
HREF="http://junkbusters.com/"
TARGET="_top"
>Junkbusters Corporation</A
>.
 There are, however, no objections from Junkbusters Corporation to the 
 <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> project itself, and they, in fact, still
 share our ideals and goals.</P
><P
> The developers also believed that there are so many improvements over the original 
 code, that it was time to make a clean break from the past and make 
 a name in their own right.</P
><P
> <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> is the 
 <SPAN
CLASS="QUOTE"
>"<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Privacy Enhancing Proxy</I
></SPAN
>"</SPAN
>. Also, its content
 modification and junk suppression gives <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>you</I
></SPAN
>, the user, more
 control, more freedom, and allows you to browse your personal and
 <SPAN
CLASS="QUOTE"
>"<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>private</I
></SPAN
> edition"</SPAN
> of the web.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="DIFFERS"
>1.7. How does Privoxy differ
from the old Junkbuster?</A
></H3
><P
> <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> picks up where
 <SPAN
CLASS="APPLICATION"
>Junkbuster</SPAN
> left off.
 The new <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> still blocks ads and banners,
 still manages <A
HREF="http://en.wikipedia.org/wiki/Browser_cookie"
TARGET="_top"
>cookies</A
>, and still
 helps protect your privacy. But, most of these features have been enhanced,
 and many new ones have been added, all in the same vein.
 </P
><P
> <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>'s new features include:</P
><P
> <P
></P
><UL
><LI
><P
>     Supports "Connection: keep-alive". Outgoing connections can
     be kept alive independently from the client. Currently not
     available on all platforms.
  </P
></LI
><LI
><P
>     Supports IPv6, provided the operating system does so too,
     and the configure script detects it.
  </P
></LI
><LI
><P
>     Supports tagging which allows to change the behaviour
     based on client and server headers.
  </P
></LI
><LI
><P
>     Can be run as an "intercepting" proxy, which obviates the need to
     configure browsers individually.
  </P
></LI
><LI
><P
>     Sophisticated actions and filters for manipulating both server and client
     headers.
   </P
></LI
><LI
><P
>     Can be chained with other proxies.
  </P
></LI
><LI
><P
>   Integrated browser-based configuration and control utility at <A
HREF="http://config.privoxy.org/"
TARGET="_top"
>http://config.privoxy.org/</A
>
   (shortcut: <A
HREF="http://p.p/"
TARGET="_top"
>http://p.p/</A
>). Browser-based
   tracing of rule and filter effects. Remote toggling.
  </P
></LI
><LI
><P
>   Web page filtering (text replacements, removes banners based on size,
   invisible <SPAN
CLASS="QUOTE"
>"web-bugs"</SPAN
> and HTML annoyances, etc.)
  </P
></LI
><LI
><P
>   Modularized configuration that allows for standard settings and
   user settings to reside in separate files, so that installing updated
   actions files won't overwrite individual user settings.
  </P
></LI
><LI
><P
>   Support for Perl Compatible Regular Expressions in the configuration files, and
   a more sophisticated and flexible configuration syntax.
  </P
></LI
><LI
><P
>   GIF de-animation.
  </P
></LI
><LI
><P
>   Bypass many click-tracking scripts (avoids script redirection).
  </P
></LI
><LI
><P
>   User-customizable HTML templates for most proxy-generated pages (e.g. "blocked" page).
  </P
></LI
><LI
><P
>   Auto-detection and re-reading of config file changes.
  </P
></LI
><LI
><P
>   Most features are controllable on a per-site or per-location basis.
  </P
></LI
><LI
><P
>   Many smaller new features added, limitations and bugs removed.
  </P
></LI
></UL
></P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="WHATSANAD"
>1.8. How does Privoxy know what is
an ad, and what is not?</A
></H3
><P
> <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>'s approach to blocking ads is twofold:</P
><P
> First, there are certain patterns in the <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>locations</I
></SPAN
> (URLs)
 of banner images. This applies to both the path (you wouldn't guess how many
 web sites serve their banners from a directory called <SPAN
CLASS="QUOTE"
>"banners"</SPAN
>!)
 and the host (blocking the big banner hosting services like doublecklick.net
 already helps a lot). <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> takes advantage of this
 fact by using <A
HREF="../user-manual/actions-file.html#AF-PATTERNS"
TARGET="_top"
>URL
 patterns</A
> to sort out and block the requests for things that sound 
 like they would be ads or banners.</P
><P
> Second, banners tend to come in certain <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>sizes</I
></SPAN
>. But you
 can't tell the size of an image by its URL without downloading it, and if you
 do, it's too late to save bandwidth. Therefore, <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>
 also inspects the HTML sources of web pages while they are loaded, and replaces
 references to images with standard banner sizes by dummy references, so that
 your browser doesn't request them anymore in the first place.</P
><P
> Both of this involves a certain amount of guesswork and is, of course, freely
 and readily configurable.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="AEN156"
>1.9. Can Privoxy make mistakes? 
This does not sound very scientific.</A
></H3
><P
> Actually, it's a black art ;-) And yes, it is always possible to have a broad
 rule accidentally block or change something by mistake. You will almost surely
 run into such situations at some point. It is tricky writing rules to
 cover every conceivable possibility, and not occasionally get false positives.</P
><P
> But this should not be a big concern since the
 <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> configuration is very flexible, and
 includes tools to help identify these types of situations so they can be
 addressed as needed, allowing you to customize your installation.
 (<A
HREF="trouble.html#BADSITE"
>See the Troubleshooting section below</A
>.)</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="AEN162"
>1.10. Will I have to configure Privoxy
 before I can use it?</A
></H3
><P
> That depends on your expectations.
 The default installation should give you a good starting
 point, and block <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>most</I
></SPAN
> ads and unwanted content,
 but many of the more advanced features are off by default, and require
 you to activate them. </P
><P
> You do have to set up your browser to use
 <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> (see the <A
HREF="installation.html#FIRSTSTEP"
>Installation section below</A
>). </P
><P
> And you will certainly run into situations where there are false positives,
 or ads not being blocked that you may not want to see. In these cases, you
 would certainly benefit by customizing <SPAN
CLASS="APPLICATION"
>Privoxy's</SPAN
>
 configuration to more closely match your individual situation. And we
 encourage you to do this. This is where the real power of
 <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> lies!</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="LAN"
>1.11. Can Privoxy run as a server on a network?</A
></H3
><P
> 
  Yes, <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> runs as a server already, and can easily be configured to
  <SPAN
CLASS="QUOTE"
>"serve"</SPAN
> more than one client. See <A
HREF="configuration.html#LANCONFIG"
>  How can I set up Privoxy to act as a proxy for my LAN</A
> below.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="BROWSERS2"
>1.12. My browser does the same things as
Privoxy. Why should I use Privoxy at all?</A
></H3
><P
>  Modern browsers do indeed have <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>some</I
></SPAN
> of the same
  functionality as <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>. Maybe this is
  adequate for you. But <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> is very
  versatile and powerful, and can probably do a number of things
  your browser just can't.
 </P
><P
>  In addition, a proxy is good choice if you use multiple browsers, or 
  have a LAN with multiple computers since <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> can run as a server  
  application. This way all the configuration is in one place, and you don't
  have to maintain a similar configuration for possibly many browsers or
  users.
 </P
><P
>  Note, however, that it's recommended to leverage both your browser's
  and <SPAN
CLASS="APPLICATION"
>Privoxy's</SPAN
> privacy enhancing features
  at the same time. While your browser probably lacks some features
  <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> offers, it should also be able to do some things more
  reliable, for example restricting and suppressing JavaScript.
 </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="WHYTRUST"
>1.13. Why should I trust Privoxy?</A
></H3
><P
>  The most important reason is because you have access to
  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>everything</I
></SPAN
>, and you can control everything. You can
  check every line of every configuration file yourself. You can check every
  last bit of source code should you desire. And even if you can't read code, 
  there should be some comfort in knowing that other people can, 
  and do read it. You can build the software from scratch, if you want,
  so that you know the executable is clean, and that it is
  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>yours</I
></SPAN
>. In fact, we encourage this level of scrutiny. It
  is one reason we use <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> ourselves.
 </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="LICENSE"
>1.14. Is there is a license or fee? What about a 
warranty? Registration?</A
></H3
><P
>  <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> is free software and licensed under the <A
HREF="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html"
TARGET="_top"
>GNU General Public License (GPL) version 2</A
>.
  It is free to use, copy, modify or distribute as you wish under the terms of this
  license.  Please see the <A
HREF="copyright.html"
>Copyright</A
> section for more
  information on the license and copyright. Or the <TT
CLASS="FILENAME"
>LICENSE</TT
> file 
  that should be included.
 </P
><P
>  There is <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>no warranty</I
></SPAN
> of any kind, expressed, implied or otherwise.
  That is something that would cost real money ;-) There is no registration either.
 </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="SPYWARE"
>1.15. Can Privoxy remove spyware? Adware? Viruses?</A
></H3
><P
> No, at least not reliably enough to trust it. <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> is not designed to be
 a malware removal tool and the default configuration doesn't even try to
 filter out any malware.</P
><P
> <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> could help prevent contact from (known) sites that use such
 tactics with appropriate configuration rules, and thus could conceivably
 prevent contamination from such sites. However, keeping such a configuration
 up to date would require a lot of time and effort that would be better spend
 on keeping your software itself up to date so it doesn't have known
 vulnerabilities.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="OTHERADS"
>1.16. Can I use Privoxy with other ad-blocking software?</A
></H3
><P
> <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> should work fine with other proxies and other software in general.</P
><P
> But it is probably not necessary to use <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> in conjunction with other
 ad-blocking products, and this could conceivably cause undesirable results.
 It might be better to choose one software or the other and work a little to
 tweak its configuration to your liking.</P
><P
> Note that this is an advice specific to ad blocking.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
NAME="HELP-THE-DEVELOPERS"
>1.17. I would like to help you, what can I do?</A
></H3
><DIV
CLASS="SECT3"
><H4
CLASS="SECT3"
><A
NAME="PARTICIPATE"
>1.17.1. Would you like to participate?</A
></H4
><P
>   Well, we <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>always</I
></SPAN
> need help. There is something for
   everybody who wants to help us. We welcome new developers, packagers,
   testers, documentation writers or really anyone with a desire to help in
   any way. You <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>DO NOT</I
></SPAN
> need to be a
   <SPAN
CLASS="QUOTE"
>"programmer"</SPAN
>. There are many other tasks available. In fact,
   the programmers often can't spend as much time programming because of some
   of the other, more mundane things that need to be done, like checking the
   Tracker feedback sections or responding to user questions on the mailing
   lists.
 </P
><P
>  So first thing, subscribe to the <A
HREF="https://lists.sourceforge.net/lists/listinfo/ijbswa-users"
TARGET="_top"
>Privoxy Users</A
>
  or the <A
HREF="https://lists.sourceforge.net/lists/listinfo/ijbswa-developers"
TARGET="_top"
>Privoxy
  Developers</A
> mailing list, join the discussion, help out other users, provide general
  feedback or report problems you noticed.
 </P
><P
>  If you intend to help out with the trackers, you also might want to <A
HREF="https://sourceforge.net/account/register.php"
TARGET="_top"
>get an account on SourceForge.net</A
>
   so we don't confuse you with the other name-less users.
 </P
><P
>   We also have a <A
HREF="../developer-manual/index.html"
TARGET="_top"
>Developer's Manual</A
>.
   While it is partly out of date, it's still worth reading.</P
><P
>   Our <A
HREF="http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/TODO?view=markup"
TARGET="_top"
>TODO list</A
>
   may be of interest to you as well.
   Please let us know if you want to work on one of the items listed.</P
></DIV
><DIV
CLASS="SECT3"
><H4
CLASS="SECT3"
><A
NAME="DONATE"
>1.17.2. Would you like to donate?</A
></H4
><P
> <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> is developed by unpaid volunteers
 and thus our current running costs are pretty low. Nevertheless, we
 have plans that will cost money in the future. We would like to get
 this money through donations made by our users.</P
><P
> <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> has therefore become an associated
 project of <A
HREF="http://www.spi-inc.org/about-spi/about-spi"
TARGET="_top"
>Software
 in the Public Interest (SPI)</A
>, which allows us to receive tax-deductible
 donations in most western countries.</P
><P
> We intend to use the donations to pay for our domain after transfering
 it to SPI. Our goal is to make sure there's no single point of failure
 and the bill gets paid and the site keeps running even if a some of
 the currently active developers were to suddenly disappear for a while.</P
><P
> We would also like to spend some money on more reliable hosting,
 on hardware to help make sure <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>
 keeps running on platforms the developers currently can't test on,
 and on technical books to educate our developers about said platforms
 or to improve their knowledge in general.</P
><P
> If you enjoy our software and feel like helping out with a donation,
 please have a look at
 <A
HREF="http://www.spi-inc.org/donations"
TARGET="_top"
>SPI's donation page</A
>
 to see what the options are.</P
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